Techniques › T1008 › AN1376
AN1376 Analytic 1376
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Establishing network connections on uncommon ports or protocols following C2 disruption or blocking. Often executed by processes that typically exhibit no network activity.</p>
- Detects
- T1008 Fallback Channels
- Part of
- DET0499 Behavioral Detection of Fallback or Alternate C2 Channels
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
| NSM:Flow | uncommon ports | DC0078 Network Traffic Flow |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
DestinationPort | Can be tuned to include unexpected or high-entropy ports not typically associated with the process. |
ProcessName | Useful to filter benign applications vs suspicious fallback attempts. |
DataVolumeRatio | Tunable ratio of sent/received bytes to indicate potential C2 beaconing or exfiltration. |
TimeWindow | Adjust temporal window to match likely fallback C2 retries after primary channel fails. |